Question: Who is the chief esecutive offier of yahoo and when did he start?
Paraphrase: When did the chief executive office of Yahoo start and who is he?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q37093 p:P169 ?s . ?s ps:P169 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2011')) }